/* Copyright (C) 2004 - 2006  db4objects Inc.  http://www.db4o.com

This file is part of the db4o open source object database.

db4o is free software; you can redistribute it and/or modify it under
the terms of version 2 of the GNU General Public License as published
by the Free Software Foundation and as clarified by db4objects' GPL 
interpretation policy, available at
http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
Suite 350, San Mateo, CA 94403, USA.

db4o is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. */
namespace Db4objects.Db4o.Defragment
{
	/// <summary>Base class for defragment ID mappings.</summary>
	/// <remarks>Base class for defragment ID mappings.</remarks>
	/// <seealso cref="Db4objects.Db4o.Defragment.Defragment">Db4objects.Db4o.Defragment.Defragment
	/// 	</seealso>
	public abstract class AbstractContextIDMapping : Db4objects.Db4o.Defragment.IContextIDMapping
	{
		private Db4objects.Db4o.Foundation.Hashtable4 _classIDs = new Db4objects.Db4o.Foundation.Hashtable4
			();

		public void MapIDs(int origID, int mappedID, bool isClassID)
		{
			if (isClassID)
			{
				MapClassIDs(origID, mappedID);
				return;
			}
			MapNonClassIDs(origID, mappedID);
		}

		protected virtual int MappedClassID(int origID)
		{
			object obj = _classIDs.Get(origID);
			if (obj == null)
			{
				return 0;
			}
			return ((int)obj);
		}

		private void MapClassIDs(int oldID, int newID)
		{
			_classIDs.Put(oldID, newID);
		}

		protected abstract void MapNonClassIDs(int origID, int mappedID);

		public abstract void Close();

		public abstract int MappedID(int arg1, bool arg2);

		public abstract void Open();
	}
}
